Happiness is Hoyt Axton's 1974 cover of Murphey and Quarto's 1972 Geronimo's Cadillac

 IMAO Axton's cover is far and away better than Murphey's original, Cher's cover, Johnny Rivers', or Jeff Stevens and the Bullets'.

That song was made for Axton's voice, and for the voices of none of the others.